EP4037052A1 - Sekundärbatterie und vorrichtung mit sekundärbatterie - Google Patents

Sekundärbatterie und vorrichtung mit sekundärbatterie Download PDF

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Publication number
EP4037052A1
EP4037052A1 EP19957739.6A EP19957739A EP4037052A1 EP 4037052 A1 EP4037052 A1 EP 4037052A1 EP 19957739 A EP19957739 A EP 19957739A EP 4037052 A1 EP4037052 A1 EP 4037052A1
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EP
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Prior art keywords
additive
secondary battery
silicon
negative electrode
electrolyte
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EP19957739.6A
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English (en)
French (fr)
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EP4037052A4 (de
EP4037052B1 (de
Inventor
Changlong Han
Zeli WU
Chenghua Fu
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Contemporary Amperex Technology Co Ltd
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Contemporary Amperex Technology Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0567—Liquid materials characterised by the additives
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0569—Liquid materials characterised by the solvents
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H01M4/0402—Methods of deposition of the material
    • H01M4/0404—Methods of deposition of the material by coating on electrode collectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/362—Composites
    • H01M4/364—Composites as mixtures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/362—Composites
    • H01M4/366—Composites as layered products
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
    • H01M4/386—Silicon or alloys based on silicon
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
    • H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/027—Negative electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/028—Positive electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2300/00—Electrolytes
    • H01M2300/0017—Non-aqueous electrolytes
    • H01M2300/002—Inorganic electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2300/00—Electrolytes
    • H01M2300/0017—Non-aqueous electrolytes
    • H01M2300/0025—Organic electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
    • H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the application relates to the technical field of batteries, in particular to a secondary battery and an apparatus containing the same.
  • the purpose of the present application is to provide a secondary battery and an apparatus containing the secondary battery, which can have better high-temperature cycle performance, high-temperature storage performance and low-temperature discharge performance at the same time.
  • a secondary battery including: a negative electrode plate including a negative electrode current collector and a negative electrode film disposed on at least one surface of the negative electrode current collector, the negative electrode film including a negative active material; an electrolyte including an electrolyte salt, an organic solvent and an additive; wherein the negative active material includes a silicon-based material; the additive includes an additive A and an additive B; the additive A is selected from one or more of the compounds shown in Formula 1; in which R 1 is selected from one or more of C2-C4 alkylene, C2-C4 halogenated alkylene, C2-C4 alkenylene, C2-C4 halogenated alkenylene, C6-C18 arylene and C6-C18 halogenated arylene;
  • a second aspect of the present application provides an apparatus, containing the secondary battery according to the first aspect of the present application.
  • the negative electrode plate includes a silicon-based material
  • the electrolyte includes both additive A and additive B
  • the melting point of additive B is below or equal to 5°C.
  • the secondary battery can have good high-temperature cycle performance, high-temperature storage performance and low-temperature discharge performance at the same time.
  • the apparatus of the present application includes the secondary battery, and thus has at least the same advantages as the secondary battery.
  • a secondary battery and an apparatus including the same according to the application are described in detail below.
  • the secondary battery according to the first aspect of the present application comprises a negative electrode plate and an electrolyte;
  • the negative electrode plate comprises a negative electrode current collector and a negative electrode film disposed on at least one surface of the negative electrode current collector, the negative electrode film comprising a negative active material;
  • the negative active material comprises a silicon-based material;
  • the electrolyte comprises an electrolyte salt, an organic solvent, and an additive;
  • the additive comprises an additive A and an additive B, and the additive A is selected from one or more of the compounds shown in Formula 1, in which R 1 is selected from one or more of C2-C4 alkylene, C2-C4 halogenated alkylene, C2-C4 alkenylene, C2-C4 halogenated alkenylene, C6-C18 arylene and C6-C18 halogenated arylene;
  • the additive B is selected from one or more in the compound shown in Formula 2; NC-R 2 -CN Formula 2 in which R 2 is selected from one or more of C1-
  • the halogen can be selected from one or more of F, Cl, Br, and I.
  • the additive shown in Formula 1 can form a dense and uniform passivation film on the surface of the silicon-based material, which can effectively prevent the direct contact between the electrolyte solvent and the silicon-based material, and reduce the side reaction of the electrolyte solvent on the surface of the negative electrode, thereby reducing the gas production of the secondary battery and improving the high-temperature storage performance of the secondary battery.
  • the film-forming resistance of the passivation film formed by the additive shown in Formula 1 on the surface of the negative electrode is relatively large, which affects the cycle performance of the battery.
  • the inventors have found through extensive research that when the electrolyte further comprises additive B, the film-forming resistance on the surface of the negative electrode can be reduced, and the low-temperature discharge performance of the secondary battery can be effectively improved.
  • the additive A is selected from one or more of the following compounds:
  • the additive B is selected from one or more of adiponitrile, glutaronitrile, 2-methylglutaronitrile, 1,2-bis(2-cyanoethoxy)ethane, 1,4-bis(2-cyanoethoxy)butane; more preferably, the additive B is selected from one or more of adiponitrile, 1,2-bis(2-cyanoethoxy)ethane.
  • the mass proportion of the additive A in the electrolyte is ⁇ 2%. If the content of additive A is too high, it will lead to an increase in the film-forming resistance on the surface of the negative electrode and deteriorate the low-temperature performance of the secondary battery.
  • the mass proportion of the additive A in the electrolyte is from 0.1% to 1%.
  • the mass proportion of the additive B in the electrolyte is ⁇ 5%. If the content of additive B is too high, too much additive B will inevitably form a film on the surface of the negative electrode, thereby deteriorating the high-temperature cycle performance of the secondary battery.
  • the content of the additive B is 0.5% to 3% based on the total weight of the electrolyte.
  • the additive may further comprise one or more of vinylene carbonate (VC), fluoroethylene carbonate (FEC), 1,3,2-dioxathiolane 2,2-dioxide (DTD), 1,3-propane sultone (PS) and 1,3-propene sultone (PST).
  • VC vinylene carbonate
  • FEC fluoroethylene carbonate
  • DTD 1,3,2-dioxathiolane 2,2-dioxide
  • PS 1,3-propane sultone
  • PST 1,3-propene sultone
  • the type of the organic solvent is not particularly limited, and can be selected according to actual needs.
  • the organic solvent may be selected from one or more of chain esters and cyclic esters.
  • the chain ester can be selected from one or more of dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, methyl propyl carbonate, methyl formate, ethyl formate, methyl acetate, ethyl acetate, propyl propionate, ethyl butyrate, ethyl propionate, and propyl butyrate;
  • the cyclic ester can be selected from one or more of ethylene carbonate, propylene carbonate, butylene carbonate, ⁇ -butyrolactone, and tetrahydrofuran.
  • the type of the electrolyte salt is not particularly limited, and can be selected according to actual needs.
  • the content of the electrolyte salt is not particularly limited, and can be selected according to actual needs.
  • the content of the electrolyte salt is 6% to 25% based on the total weight of the electrolyte; more preferably, the content of the electrolyte salt is 6% to 20% based on the total weight of the electrolyte.
  • the secondary battery further comprises a positive electrode plate, wherein the positive electrode plate comprises a positive electrode current collector and a positive electrode film disposed on at least one surface of the positive electrode current collector, the positive electrode film comprising a positive active material.
  • the positive active material comprises one or more of lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, transition metal phosphate, etc.; more preferably, the positive active material comprises one or more of lithium cobalt oxide (for example, lithium cobaltate).
  • the positive active material comprises lithium cobalt oxide, the improvement effect of the electrolyte of the present application on the battery performance is more obvious.
  • the type of the positive electrode current collector is not particularly limited, and can be selected according to specific requirements.
  • the positive electrode current collector may be selected from metal foils, for example, the positive electrode current collector may be selected from aluminum foils.
  • the type of the negative electrode current collector is not particularly limited, and can be selected according to specific requirements.
  • the negative electrode current collector may be selected from metal foils, for example, the positive electrode current collector may be selected from copper foils.
  • the silicon-based material comprises one or more of elemental silicon, silicon-oxygen compound, silicon-carbon composite, silicon-nitrogen composite, and silicon alloy; more preferably, the silicon-based material comprises a silicon-oxygen compound.
  • the negative active material further comprises one or more of natural graphite, artificial graphite, soft carbon, and hard carbon; more preferably, the negative active material further comprises one or more of natural graphite and artificial graphite.
  • the secondary battery further comprises a separator.
  • the type of the separator is not particularly limited, and it may be various separators suitable for secondary batteries in the art.
  • the separator can be selected from one or more of polyethylene films, polypropylene films, polyvinylidene fluoride films and the multi-layer composite films thereof.
  • the secondary battery may comprise an outer package used for packaging the positive electrode plate, the negative electrode plate and the electrolyte.
  • the positive electrode plate, the negative electrode plate and the separator can be laminated or wound to be a laminated electrode assembly or a wound electrode assembly that is packaged in the outer package; and the electrolyte is infiltrated into the electrode assembly.
  • the number of the electrode assemblies in the secondary battery can be one or more, and can be adjusted as needed.
  • the outer packaging of the secondary battery may be a soft bag, such as a bag-type soft bag.
  • the material of the soft bag can be plastic, such as one or more of polypropylene (PP), polybutylene terephthalate (PBT), polybutylene succinate (PBS).
  • the outer packaging of the battery may also be a hard case, such as an aluminum case.
  • Fig. 1 shows a secondary battery 5 with a square structure as an example.
  • the secondary battery can be assembled into a battery module, and the number of secondary batteries contained in the battery module can be multiple, and the specific number can be adjusted according to the application and capacity of the battery module.
  • Fig. 2 shows a battery module 4 as an example.
  • a plurality of secondary batteries 5 may be disposed sequentially in the length direction of the battery module 4.
  • the secondary batteries 5 may also be disposed in any other manner.
  • the plurality of secondary batteries 5 may be fixed by fasteners.
  • the battery module 4 may further comprise a housing with a receiving space, and the plurality of secondary batteries 5 are received in the receiving space.
  • the above-mentioned battery module may also be assembled into a battery pack, and the number of battery modules contained in the battery pack can be adjusted according to the application and capacity of the battery pack.
  • the battery pack 1 may comprise a battery case and a plurality of battery modules 4 disposed in the battery case.
  • the battery case comprises an upper case body 2 and a lower case body 3.
  • the upper case body 2 can cover the lower case body 3 to form a closed space for receiving the battery modules 4.
  • a plurality of battery modules 4 can be disposed in the battery case in any manner.
  • the apparatus according to the second aspect of the present application comprises the secondary battery according to the first aspect of the present application, and the secondary battery can be used as a power source of the apparatus or as an energy storage unit of the apparatus.
  • the apparatus comprises, but is not limited to, a mobile apparatus (e.g., a mobile phone, a laptop computer, etc.), an electric vehicle (e.g., a pure electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, an electric bicycle, an electric scooter, an electric golf vehicle, an electric truck), an electric train, a ship, a satellite, an energy storage system, etc.
  • a mobile apparatus e.g., a mobile phone, a laptop computer, etc.
  • an electric vehicle e.g., a pure electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, an electric bicycle, an electric scooter, an electric golf vehicle, an electric truck
  • an electric train e.g., a ship, a satellite, an energy storage system, etc.
  • the apparatus may comprise the secondary battery, the battery module or the battery pack selected according to its usage requirements.
  • Fig. 5 shows an apparatus as an example.
  • the apparatus is a pure electric vehicle, a hybrid electric vehicle, or a plug-in hybrid electric vehicle.
  • the battery pack or battery module can be used.
  • the apparatus may be a mobile phone, a tablet computer, a notebook computer, etc.
  • the apparatus is generally required to be thin and light, and the secondary battery can be used as a power supply.
  • the secondary batteries in embodiments 1-17 and comparative examples 1-4 are prepared according to the following method:
  • a positive active material LiCoO 2
  • a binder polyvinylidene fluoride
  • a conductive agent Super P
  • NMP N-methylpyrrolidone
  • the content of LiPF 6 was 12.5% based on the total weight of the electrolyte.
  • the types, characteristic parameters and contents of additives were shown in Table 1. In Table 1, the content of the additive was the weight percentage calculated based on the total weight of the electrolyte.
  • a polyethylene membrane was used as a separator.
  • the positive electrode plate, the separator, and the negative electrode plate were stacked in order, so that the separator was located between the positive electrode plate and the negative electrode plate for isolation. After winding, a bare battery core was obtained. The bare battery core was put into the outer packaging, in which the above-mentioned electrolyte was then added, and after encapsulation, standing, formation, and aging, a secondary battery was obtained. Table 1 Parameters of Embodiments 1-17 and Comparative Examples 1-4 No.
  • the secondary battery was charged to 4.3V with a constant current of 0.5C, and then charged to a current of 0.05C with a constant voltage of 4.3V.
  • the volume of the secondary battery at this time was measured by the drainage method and recorded as V 1 ; then the secondary battery was placed in a constant-temperature box at 60°C, and taken out after being stored for 30 days, and the volume of the secondary battery at this time was measured and recorded as V2.
  • volume expansion rate (%)of the secondary battery after storage at 60°C for 30 days [(V 2 -V 1 )/V 1 ] ⁇ 100%.
  • the secondary battery was charged with a constant current of 1C to 4.3V, then charged with a constant voltage of 4.3V to a current of 0.05C, standing for 5 minutes, and then discharged with a constant current of 1C to 2.8V. This was the first charge-discharge cycle of the secondary battery, and the resulting discharge capacity was recorded as the discharge capacity of the secondary battery at the first cycle.
  • the secondary battery was charged and discharged for 800 cycles according to the above procedure, and the discharge capacity of the secondary battery after 800 cycles was recorded.
  • the capacity retention rate (%) of the secondary battery after 800 cycles at 45°C (discharge capacity of the secondary battery after 800 cycles /discharge capacity of the secondary battery at the first cycle) ⁇ 100%.
  • the secondary battery was charged with a constant current of 1C (nominal capacity) to 4.3V, then charged with a constant voltage of 4.3V to a current of 0.05C, standing for 5 minutes, and then discharged with a constant current of 1C to a cut-off voltage of 2.8 V, and the actual discharge capacity of the secondary battery at this time was measured and recorded as do.
  • the secondary battery was charged with a constant current of 1C (nominal capacity) to 4.3V, and then charged with a constant voltage to a current of 0.05C, standing for 5 minutes, and then standing at -10°C for more than 4 hours, so that the temperature of the secondary battery reached -10°C, after which the secondary battery was discharged with a constant current of 0.5C to a cut-off voltage of 2.8V.
  • the actual discharge capacity of the secondary battery at this time was measured and recorded as d 1 .
  • Discharge capacity retention rate (%) of secondary battery at -10°C (discharge capacity d 1 at -10°C/discharge capacity do at 25°C) ⁇ 100%.
  • Example 1 17.5 81.0 87.5
  • Example 4 12.1 89.1 84.1
  • Example 5 11.8 88.9 82.5
  • Example 6 9.2 87.5 79.5
  • Example 12 11.1 89.0 86.1
  • Example 13 10.5 80.9 85.5
  • Example 14 13.5 88.1 83.5
  • Example 15 14.1 87.5 82.9
  • the secondary batteries of Examples 1-17 of the present application used silicon-based materials as the negative active material, and the electrolyte was added with additive A and additive B having a melting point of below or equal to 5°C. Under the combined action, the secondary battery of the present application had better high-temperature cycle performance, high-temperature storage performance and low-temperature discharge performance at the same time.
  • the additive B added to the electrolyte in Comparative Example 4 did not satisfy Formula 2, and the high-temperature cycle and low-temperature discharge performance of the obtained secondary battery deteriorated.

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  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Inorganic Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Physics & Mathematics (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Secondary Cells (AREA)
  • Battery Electrode And Active Subsutance (AREA)
EP19957739.6A 2019-12-24 2019-12-24 Sekundärbatterie und vorrichtung mit sekundärbatterie Active EP4037052B1 (de)

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CN117501502A (zh) * 2022-05-11 2024-02-02 宁德时代新能源科技股份有限公司 一种电解液、二次电池、电池模块、电池包和用电装置
WO2024148555A1 (zh) * 2023-01-12 2024-07-18 宁德时代新能源科技股份有限公司 一种包含掺杂的正极活性材料的锂离子电池
CN117321826B (zh) * 2023-03-02 2026-04-03 宁德时代新能源科技股份有限公司 电池单体、电池和用电装置
CN121123282A (zh) * 2023-06-07 2025-12-12 宁德时代新能源科技股份有限公司 二次电池以及包括该二次电池的用电装置
CN119208503B (zh) * 2023-06-25 2025-11-14 宁德时代新能源科技股份有限公司 电池极片及其制备方法、二次电池、用电设备

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JP5668929B2 (ja) * 2011-03-23 2015-02-12 ソニー株式会社 二次電池、電子機器、電動工具、電動車両および電力貯蔵システム
JP5935318B2 (ja) * 2011-12-26 2016-06-15 ソニー株式会社 リチウムイオン二次電池用電解液、リチウムイオン二次電池、電池パック、電動車両、電力貯蔵システム、電動工具および電子機器
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JP6098684B2 (ja) * 2015-08-12 2017-03-22 セントラル硝子株式会社 非水電解液二次電池用電解液及びそれを用いた非水電解液二次電池
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CN112670666B (zh) * 2019-05-07 2022-08-12 宁德新能源科技有限公司 电化学装置

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CN114175342B (zh) 2025-03-07
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US11961961B2 (en) 2024-04-16
CN114175342A (zh) 2022-03-11
JP2022550955A (ja) 2022-12-06
KR102661439B1 (ko) 2024-04-26
EP4037052A4 (de) 2022-10-12
KR20220053663A (ko) 2022-04-29
EP4037052B1 (de) 2023-07-05
WO2021128000A1 (zh) 2021-07-01

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